Recovery of cesium ions from seawater using a porous silica-based ionic liquid impregnated adsorbent
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A porous silica-based adsorbent was prepared by impregnating the pores of a silica support with theextractant 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-calix[4]arene (Calix[4]arene-R14) and anadditive agent 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C2mim þ NTf2) as thematerials to remove cesium(I) (Csþ) ions from seawater. The as-prepared adsorbent showed excellentadsorption performance toward Csþ ions, with adsorption equilibrium reached within 2 h and anadsorption amount of 0.196 mmol/g observed. The solution pH, temperature, and the presence ofcoexisting metal ions were found to have almost no effect on Csþ adsorption. The adsorption mechanismwas considered to proceed via ion exchange between Csþ and C2mimþ. In addition, the particle-inducedX-ray emission analysis results further clarified that the adsorbed Csþ ion species on the adsorbent wasin the form of both CsCl and CsBr
Abstract
A porous silica-based adsorbent was prepared by impregnating the pores of a silica support with theextractant 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-calix[4]arene (Calix[4]arene-R14) and anadditive agent 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C2mim þ NTf2) as thematerials to remove cesium(I) (Csþ) ions from seawater. The as-prepared adsorbent showed excellentadsorption performance toward Csþ ions, with adsorption equilibrium reached within 2 h and anadsorption amount of 0.196 mmol/g observed. The solution pH, temperature, and the presence ofcoexisting metal ions were found to have almost no effect on Csþ adsorption. The adsorption mechanismwas considered to proceed via ion exchange between Csþ and C2mimþ. In addition, the particle-inducedX-ray emission analysis results further clarified that the adsorbed Csþ ion species on the adsorbent wasin the form of both CsCl and CsBr
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